Summit currently runs 3 Leagues with 64 teams in each. However to keep the processing of Leagues more manageable each League is restricted to roughly 50 managed teams. Teams for new managers are extremely limited. If all Leagues are showing as FULL then it is still worthwhile requesting a new team as you WILL receive one through the post asap.
When a League is shown as having spaces then that space may have already been sent to a potential new manager and I will not know until the following turn if they have accepted that job offer. It means that when a League is shown as having spaces you still might not receive a club straight away.
Note that if you have already been sent a team recently, not responded and now changed your mind then open a support ticket to request a new team since you already know what the game looks like which means that your new team request will be filed in the deleted folder. Sorry but I cannot keep sending teams out to people that do not respond multiple times.
There are currently (December 2024) spaces as follows:
League 1: 2 spaces
League 2: 2 spaces
League 3: FULL